<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Document</title>
</head>

<body>
  <h1>hello world</h1>
  <h4>{{data}}</h4>
  <form action="/" method="POST">
    <input type="text" name="uname" />
    <input type="submit" value="提交" />
  </form>
</body>

</html>